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The phrase is a specific Google dork (a search operator used to find vulnerable directories). Let's break it down:

When combined, intitle:"index of" "email.txt" 2021 (or similar variations) searches for publicly exposed directories that contain plaintext email logs or databases from that year.

Options -Indexes

Or add to .htaccess:

<Files "*.txt">
    Require all denied
</Files>

Each file gets a risk score (0–100):

Several organizations provide anonymized email indices for academic use:

If you lost your own 2021 emails:

Three main reasons:

2021 was a peak year for remote work, leading to rushed cloud migrations and many misconfigured S3 buckets or Apache folders.

In early 2022, security firm UpGuard discovered an unsecured Amazon S3 bucket owned by a marketing analytics company. The bucket contained over 800 .txt files with names like campaign_emails_2021-06-01.txt. Those files held 82 million unique email addresses – many belonging to EU citizens.

The company was fined €425,000 under GDPR for failing to protect personal data. The bucket’s index was publicly listed on Google for four months before discovery. Anyone searching intitle:"index of" "email" "2021" txt could have downloaded the entire dataset.

The lesson: Just because a directory is indexed does not mean it is legal or ethical to browse.